If you can handle it being 3” high from the center of the glass to the top of the bar, I’m extremely happy with my Front Runner load bars. They are for an H3 as they were the cheapest available, and only required adding fender washers to fit right in the factory short roof rails. I added the wind deflector since there was a whistling noise without it.
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Coincidentally, these bars end up being the exact dimensions of the Front Runner RTT, it’s 49” wide and 53” long. These rails have tracks that can hold a captive nut, so my plan is to just drill holes in the floor pan of the RTT when I eventually order one. I haven’t had a need for it yet.
The rails also work great for lumber, canoes, etc and you can easily add the front runner bike, kayak, or other racks, I haven’t bought any yet.
As far as general duffel bag storage up there, I plan to order a sheet of HDPE or just use some plywood coated with epoxy and painted. I just want a flat rack with a bunch of routed out holes to tie stuff down to when necessary.